Foot control for shank and bit punches



1929. H. v. HAIGHT 1,723,730

FOOT CONTROL FOR SHANK AND BIT PUNCHES Filed Nov. z, 1925 2 Sheets-Sheet 1 INVENTOR.

Aug. 6, 1929. v, H HT 1,723,730

FOOT CONTROL FOR SHANK AND BIT PUNCHES Filed Nov. 5, 1925 2 sheets-sheet 2 O Ifd INVENTOR. f 3 Hum E2701 5 & BY

Patented Aug. 6, 1929.

UNITED STATES PATENT OFFICE.

HARRY V. HAIGHT, OF SHERBROOKE, QUEBEC, CANADA, ASSIGNOR TO INGERSOLLMD COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

roo'r common FOR SHANK AND BIT rumours.

Application filed November in mechanism and to automatically shut o the pressure fluid to the percussive and feeding element after the punching operation is completed.

Other objects will be in part obvious and in part pointed out hereinafter.

The invention consists of the combinations of elements, features of construction and arrangement of parts having the general mode of operation substantially as hereinafter described and more particularly pointed out in the appended claims and illustrated in the accompanying drawings, in which Figure 1- is an outlined View in elevation of a shank and bit punch and a foot control therefor mounted on a sharpening machine,

Figure 2 is an enlarged detail view in elevation and partly in section illustrating the position of the parts while the punch pin is being driven into the drill steel,

Figure 3 is a view similar to Figure 2 illust'rating the position of the parts while i the punch pin is being withdrawn from the drill steel, and

Figure 4; is a view of the valve chest and the valve showing the manner in which the cam cooperates with the valve for shutting off the supply of pressure fluid to the percussive and feeding elements of the punch. Referring to the drawings, A indicates a shank and bit punch mounted slidably on a bar B and being provided with a punch pin C which is adapted to' be driven into a drill steel D for the purpose of reforming the bore adjacent the shank and, bit {ends of the drill steel. Any suitable mounting" maybe provided for the punch. In the present instance, the punch is shown secured to a sharpening machine for convenience of illustration, althouglf'the punch A may be used in connection with any suitable clamping device.

In the present instance a brace E forms a support for one end of the bar B and the s, 1925. Serial No. 66,622.

sharpening machine G. The drill steel D 1 may be clamped between the body of the sharpening machine and a reciprocator cross head H and is limited against longltudinal movement in one direction by a stop J bolted or otherwise secured to the bracket F. i 7

Within the percussive cylinder K of the punch A is a reciprocator hammer piston L to deliver blows in a orward direction on an anvil block 0 which in this instance also serves as a chuck for the punch pin G which is preferably held within the anvil block 0 by means of a dowel pin 1?. Longitudinal movement of the anvil block Ois in this instance limited by a shoulder 0 formed on said anvil block. The piston L is of the differential type and in addition to driving the pin also controls the admission of pressure fluid to the end faces Q to receive a front head U.

Arranged slidably on the front head U is a cross head V which is bored to serve as a guide for one end of the anvil block 0. A back head W forms a closure for the rearward end of the cylinder K and is bored to receive slidably an anvil block X arranged therein for the urpose of driving the punch pin C out of t steel D. Disposed slidably on the back head W is a cross head Y bored to receive slidably an end of the anvil block X. The cross heads V and Y are preferably held in spaced relation with respect to each other by means of suitable spacers Z through which extend bolts 6 whereby the cross heads are clamped together in such a manner that they may slide in unison when pressure is applied to either end of the unit thus formed.

The rearward end of the piston L is constantly exposed to pressure fluid which enters said cylinder through a passage 0. In this instance the passage 0 is also extended toward the forward end of the cylinder for admitting pressure fluid to the face, R of the piston head S. Pressure fluid to the front end of the cylinder is con veyed thereto through a passage d. In this e drill instance a port 6 forms a free exhaust for the pressure fluid and is controlled by the piston head S. The opening of the passage 0 to the rear end of the cylinder K is so arranged that pressure fluid passing therefrom into the cylinder will act against the inner face of the anvil block X and constantly tend to hold said anvil block out of the path of the piston L while the punch pin 0 is being driven into the drill steel D.

Suitable means are usually provided in machines of this type for advancing the punch in the direction of the drill steel D and also for retracting the punch after the punch pin C has penetrated the drill steel D to a sutlicient depth for reforming the bore within the drill steel. To this end, a feeding mechanism comprising a feeding cylinder 7, which is preferably formed integrally with the cylinder K, is rovided with a piston g which is secure to the brace E and held stationary with respect thereto by means of a piston red It. The free end of the piston rod h is preferably screw threaded as illustrated to receive suitable nuts j, which in addition to holding the piston g stationary, also serve as a means for adjusting the position of said piston with respect to the cylinder f. A back head is in this instance forms a closure for the rearward end of the cylinder f and is suitably bored as at 0 to guide the piston rod h. p p

In accordance with the present invention a valve chest p is secured to the back head and is provided with a longitudinal chamber to receive slidably a pressure fluid controlling valve 7' having a stem 3 which extends exterior of the chamber g through a cap t screwed to the end of a plug a. The plug it in this instance-serves to limit the travel of the valve in one direction and is bored to receive a packing e which is held in position by the cap it. The valve 9' preferably has a longitudinal bore w which is in constant communication with a source of pressure fluid supplied through ports a: formed diagonally in one endof the valve, and through a connection 3/ suitably secured to the valve chest 12. A pair of'ports 2 and 2 in the valve 1' lead from the bore w to the periphery of the valve to register in one position of the valve with a passage 3 leading to the front end of the feeding cylinder f and with a passage 4 leading from the chamber g to the passage 0.

In another limiting position of the valve the port a is adapted to register with the passage 4: and the port 2 in this position of thefivalve is adapted to register with a passage 5 leading to the rearward end of the feeding cylinder f. Exhaust passages 6 and 7 are formed in the valve chest 72 for exhausting pressure fluid from the front and rear ends of the feeding cylinder f respectively. The passages 6 and 7 are so arranged with respect to the passages 3 and 5 leading to the ends of the cylinder f that when the valve is in position to admit pressure fluid to one end of the feeding cylinder 7 the other end of the feeding cylinder will be opened to atmosphere. Communication between the passage 3 and the exhaust port 6 is in this instance atlorded by an annular groove 8 near the upper end of the valve 9'. A similar groove 9 is formed near the opposite end ofthe valve for establishing communication between the passage 5 and the exhaust port 7. A plug 10 is in this instance screwed in the upper end of the chamber 9 for the purpose of sealing said chamber.

Disposed within the upper end of the valve 1' is a plug 12 which is provided with a small port 13 through which pressure fluid may constantly pass from the interior of the valve to the end of the chamber 9. Pressure fluid thus passing through the port 13 will pass into a hose connection 14, which is in efi'ect a pressure chamber. sure fluid within the hose and the upper end of the' chamber 9 becomes of suflicient value to overcome the pressure acting against the opposite end of the valve 1' the valve will automatically be actuated to its other l'unit- J ing position.

To the end that the pressure fluid accumulated in the hose 14 may be released whenever it is desired to start the punch, a valve box 15 is secured to the opposite end ol? the hose to receive a pressure releasing valve 16 normally held on its seat by a spring 17. A plate 18 is secured to the upper end of the valve box and is held in position by a suitable nut 19 to support a treadle 2t) hinged thereto at one end as at 21. The valve box 15 is provided with a plurality of exhaust passages 22 for exhausting pressure fluid from the chamber or hose 1% when the valve 16 is unseated. In order that the valve 1' may be automatically actuated to a neutral position, a cam 23- is arranged beneath the stem 8 to cooperatetherewith for raising the valve 1' after the punching operation is completed. The cam 23 may be secured to the device in any suitable manner, but in this instance an upwardly extending leg 24 of the cam is secured to the connecting rod h and the other end of the cam is secured to the body of the sharpening machine G.

In the operation of the device, assuming that the punch pin C is about to be driven into the drillsteel D as illustrated in Figure 2, and assuming furtherthat the valve 1' is then in position shown in Figure 4, which would be the position of the valve while the machine is. at rest. It then the operator presses his foot on the treadle 20 and opens the valve 16, the accumulated pressure fluid After the pres lUU in the chamber or hose 14 will be exhausted to the atmosphere and permit the pressure acting against the opposite end of the valve 1" to raise said valve to the position shown punch to move toward the drill steel D.

. At the same time the piston L will deliver blows against the anvil block 0 which will be automatically forced inwardly into the path of the piston by the resistance of the drill steel against the punch pin 0. After the pressure fluid has been exhausted from the chamber 14 the operator may remove his foot from the treadle 20 since the succeeding operations of the punch will be entirely automatic as will be explained hereinafter. During the time that the punch pin 0 is being driven into the drill steel D, pressure fluid will pass through the port 13 into the upper end of the chamber (1 and into the hose or chamber 14 and will build up sufficient pressure within the upper end of the chamber g to overcome the pressure acting against the Opposite end of the valve. .The pressure fluid thus entrapped will automatically move the valve to its other or downward limiting position at about the time that the punch pin C has been driven into'the drill steel D to a sufficient depth to open the bore thereof. Upon reversal of the valve 1', the port a will be moved into registration with the passage 4 leading to the cylinder L and the port 2 will register with thepassage 5 leading to the rearward end of the feeding cylinder f. In this position of the valve r thefront end of the feeding'cylinder 7 will be placed in communication with the'atmosphere through the port 6 and the annu-- lar groove 8. By thus automatically causing the valve 1' to be actuated to its lowermost limiting position and thereby admitting pressure fluid to the rearward end of the cylinder f, the punch will automatically be caused to travel rearwardly on the bar B. As the punch A starts in a rearward direction the resistance caused by the drill steel D on the punch pin C will momentarily hold said pin stationary until the cross head V contacts with the shoulder O of the anvil block 0, thus also holding the cross heads V and Y momentaril stationary. Continued rearward travel 0 the punch will expose the inner face of the anvil block X to the blows of the piston and thus drive the punch pin C out of the drill steel D. As the punch A approaches the rearward stopping position on the bar B the stem 8 of the valve r will slide over the cam 23 and raise said valve to the neutral position illustrated in Figure 4, thus cutting off the supply of pressure fluid to the cylinders K and f, andcompleting the cycle of operations.

I claim:

1. In a shank and bit punch, the combination of means for clamping a drill steel,

a pin adapted to enter the drill steel, a

percussive element to drive the pin into and out of the steel, a feeding element for advancing and. withdrawing the punch, a valve chest on the punch, a pressure chamber at one end of the chest, a valve in the chest, and means for exhausting pressure fluid from the pressure chamber for opening the valve to admit pressure fluid to the percussive and feeding elements for advancing the punch and driving the pin into the steel and for automatically returning the punch.

2. In a shank and bit punch, the combination of means for clamping a drill steel, a pin adapted to enter the drill steel, :1. percussive element to drive the pin into and out of the steel, a feeding element for advancing and withdrawing the punch, a valve chest on the punch, a pressure chamber at one end of the chest, a valve in the chest, means for exhausting pressure fluid from the pressure chamber for opening the valve to admit pressure fluid to the ercussive and feeding elements for advancing the punch and driving the pin into the steel and for automatically returning the punch.

3. In a shank and bit punch, the combination of means for clamping a drill steel, a pin adapted to enter the drill steel, a percussive element to drive the pin into and out of the steel, a feeding element for advancing and Withdrawing the punch, a valve chest on the punch, apressure chamber at one end of the chest, a valve in the chest, foot controlled means for exhausting pressure fluid from the pressure. chamber for opening the valve to admit pressure fluid to the percussive and feeding elements for advancing the punch and driving the pin into the steel and for automatically returning the punch.

4. In a shank and bit punch, the combination of means for clamping a drill steel, a pin adapted to enter the drill steel, a percussive element to drive the pin into and out of the steel, a feeding element for advancing and retracting thepunch, a valve chest on the punch, a pressure chamber at one end of the chest, a controlling valve in the chest for controlling the admission of pressure fluid to the percussive and feeding end of the chest, a spring to close the releasing valve whereby pressure fluid may be trapped in the pressure chamber for automatically actuating the controlling valve toward the other end of the chest, and means for automatically closing the controlling valve.

' 5. In a shank and bit punch, the combination of means for clamping a drill steel, a pin adapted to enter the drill steel, a percussive element to drive the pin into and out of the steel, a feeding element for advancing and retracting the punch, a valve chest movable with the percussive element, a pressure chamber associated with one end of the chest, a controlling valve in the chest having two opening positions, said valve having a bore in constant communication with a supply of pressure fluid, a port in the valve admitting pressure fluid into the said pressure chamber to move the valve to one opening position for retracting the punch, a releasing valve at one end of the pressure chamber for releasing pressure fluid therefrom to enable the controlling valve to be moved to its other opening posi tion for advancing the percussive element, means to open the releasing valve, and means to move the controlling valve to a neutral position for automatically stopping the punch.

In testimony whereof I have signed this specification.

HARRY V. HAIGHT. 

